import * as React from 'react';
import Notification from 'rc-notification';
import Icon from '../icon';

export type NotificationPlacement = 'topLeft' | 'topRight' | 'bottomLeft' | 'bottomRight';

export type IconType =  'success' | 'info' | 'error' | 'warning';

const notificationInstance: { [key: string]: any } = {};
let defaultDuration = 4.5;
let defaultTop = 24;
let defaultBottom = 24;
let defaultPlacement: NotificationPlacement = 'topRight';
let defaultGetContainer: () => HTMLElement;

export interface ConfigProps {
  top?: number;
  bottom?: number;
  duration?: number;
  placement?: NotificationPlacement;
  getContainer?: () => HTMLElement;
}
function setNotificationConfig(options: ConfigProps) {
  const { duration, placement, bottom, top, getContainer } = options;
  if (duration !== undefined) {
    defaultDuration = duration;
  }
  if (placement !== undefined) {
    defaultPlacement = placement;
  }
  if (bottom !== undefined) {
    defaultBottom = bottom;
  }
  if (top !== undefined) {
    defaultTop = top;
  }
  if (getContainer !== undefined) {
    defaultGetContainer = getContainer;
  }
}

function getPlacementStyle(placement: NotificationPlacement) {
  let style;
  switch (placement) {
    case 'topLeft':
      style = {
        left: 0,
        top: defaultTop,
        bottom: 'auto',
      };
      break;
    case 'topRight':
      style = {
        right: 0,
        top: defaultTop,
        bottom: 'auto',
      };
      break;
    case 'bottomLeft':
      style = {
        left: 0,
        top: 'auto',
        bottom: defaultBottom,
      };
      break;
    default:
      style = {
        right: 0,
        top: 'auto',
        bottom: defaultBottom,
      };
      break;
  }
  return style;
}

function getNotificationInstance(prefixCls: string, placement: NotificationPlacement, callback: (n: any) => void) {
  const cacheKey = `${prefixCls}-${placement}`;
  if (notificationInstance[cacheKey]) {
    callback(notificationInstance[cacheKey]);
    return;
  }
  (Notification as any).newInstance({
    prefixCls,
    className: `${prefixCls}-${placement}`,
    style: getPlacementStyle(placement),
    getContainer: defaultGetContainer,
  }, (notification: any) => {
    notificationInstance[cacheKey] = notification;
    callback(notification);
  });
}

const typeToIcon = {
  success: 'check-circle-o',
  info: 'info-circle-o',
  error: 'cross-circle-o',
  warning: 'exclamation-circle-o',
};

export interface ArgsProps {
  message: React.ReactNode;
  description: React.ReactNode;
  btn?: React.ReactNode;
  key?: string;
  onClose?: () => void;
  duration?: number | null;
  icon?: React.ReactNode;
  placement?: NotificationPlacement;
  style?: React.CSSProperties;
  prefixCls?: string;
  className?: string;
  readonly type?: IconType;
}
function notice(args: ArgsProps) {
  const outerPrefixCls = args.prefixCls || 'ant-notification';
  const prefixCls = `${outerPrefixCls}-notice`;
  const duration = args.duration === undefined ? defaultDuration : args.duration;

  let iconNode: React.ReactNode = null;
  if (args.icon) {
    iconNode = (
      <span className={`${prefixCls}-icon`}>
        {args.icon}
      </span>
    );
  } else if (args.type) {
    const iconType = typeToIcon[args.type];
    iconNode = (
      <Icon
        className={`${prefixCls}-icon ${prefixCls}-icon-${args.type}`}
        type={iconType}
      />
    );
  }

  const autoMarginTag = (!args.description && iconNode)
    ? <span className={`${prefixCls}-message-single-line-auto-margin`} />
    : null;

  getNotificationInstance(outerPrefixCls, args.placement || defaultPlacement, (notification: any) => {
    notification.notice({
      content: (
        <div className={iconNode ? `${prefixCls}-with-icon` : ''}>
          {iconNode}
          <div className={`${prefixCls}-message`}>
            {autoMarginTag}
            {args.message}
          </div>
          <div className={`${prefixCls}-description`}>{args.description}</div>
          {args.btn ? <span className={`${prefixCls}-btn`}>{args.btn}</span> : null}
        </div>
      ),
      duration,
      closable: true,
      onClose: args.onClose,
      key: args.key,
      style: args.style || {},
      className: args.className,
    });
  });
}

const api: any = {
  open: notice,
  close(key: string) {
    Object.keys(notificationInstance)
      .forEach(cacheKey => notificationInstance[cacheKey].removeNotice(key));
  },
  config: setNotificationConfig,
  destroy() {
    Object.keys(notificationInstance).forEach(cacheKey => {
      notificationInstance[cacheKey].destroy();
      delete notificationInstance[cacheKey];
    });
  },
};

['success', 'info', 'warning', 'error'].forEach((type) => {
  api[type] = (args: ArgsProps) => api.open({
    ...args,
    type,
  });
});

api.warn = api.warning;

export interface NotificationApi {
  success(args: ArgsProps): void;
  error(args: ArgsProps): void;
  info(args: ArgsProps): void;
  warn(args: ArgsProps): void;
  warning(args: ArgsProps): void;
  open(args: ArgsProps): void;
  close(key: string): void;
  config(options: ConfigProps): void;
  destroy(): void;
}
export default api as NotificationApi;
